Active coating
Tóm tắt
Preventing the corrosion of metal substrates by applying an active coating was studied. The active coating was prepared by addition of metal powder and polyaniline in xylene solution. Trials were conducted by coating a blast-cleaned, mild steel round bar with a brush. The coating was dried in the air and the steel samples were immersed in water collected from the open sea. Open circuit potential of steel was measured with silver/silver chloride reference electrode. The potential in seawater was in the range of — 740mV to — 956mV, indicating complete protection of steel against corrosion. This potential meets the criteria for protection as per clause 5.4.1 of Det Norsk Veritas Recommended Practice RPB 401 (1993), page 8.1 The active coating system can be used for protecting the steel against corrosion in marine and any other highly corrosive environment. Accelerated tests in accordance with ASTM D5894 — 962 with freeze cycle developed by U.S. Federal Highway Administration are planned.
Tài liệu tham khảo
DNV RP B401, “Recommended practice — Cathodic protection design”, Det Norske Veritas Industri Norge AS, Oslo, Norwa, 1993.
ASTM Standard D5894 - 96, Annual Book of ASTM Standards,06.01, (Philadelphia, PA, USA: ASTM)
Tallman DE, Y Pae and GP Bierwagen, “Conducting polymers and corrosion: Polyaniline on steel,”Corrosion,55, (8), 779–786, 1999
McAndrews TP, “Corrosion protection with electrically conducting polymers,”Trends in Polymer Sci.,5, (1), 7–12, 1997